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<div class="title">Upscaling video </div>  </div>
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<div class="textblock"><p>In this tutorial you will learn how to use the 'dnn_superres' interface to upscale video via pre-trained neural networks.</p>
<h2>Building </h2>
<p>When building OpenCV, run the following command to build all the contrib module:</p>
<div class="fragment"><div class="line">cmake -D OPENCV_EXTRA_MODULES_PATH=&lt;opencv_contrib&gt;/modules/</div></div><!-- fragment --><p>Or only build the dnn_superres module:</p>
<div class="fragment"><div class="line">cmake -D OPENCV_EXTRA_MODULES_PATH=&lt;opencv_contrib&gt;/modules/dnn_superres</div></div><!-- fragment --><p>Or make sure you check the dnn_superres module in the GUI version of CMake: cmake-gui.</p>
<h2>Source Code of the sample </h2>
<div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;<span class="comment">// This file is part of OpenCV project.</span></div><div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="comment">// It is subject to the license terms in the LICENSE file found in the top-level directory</span></div><div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="comment">// of this distribution and at http://opencv.org/license.html.</span></div><div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;</div><div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="preprocessor">#include &lt;iostream&gt;</span></div><div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;</div><div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="../../d3/db0/dnn__superres_8hpp.html">opencv2/dnn_superres.hpp</a>&gt;</span></div><div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;</div><div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="../../d1/d4f/imgproc_2include_2opencv2_2imgproc_8hpp.html">opencv2/imgproc.hpp</a>&gt;</span></div><div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;<span class="preprocessor">#include &lt;<a class="code" href="../../d4/dd5/highgui_8hpp.html">opencv2/highgui.hpp</a>&gt;</span></div><div class="line"><a name="l00011"></a><span class="lineno">   11</span>&#160;</div><div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;<span class="keyword">using namespace </span>std;</div><div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;<span class="keyword">using namespace </span><a class="code" href="../../d2/d75/namespacecv.html">cv</a>;</div><div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="keyword">using namespace </span>dnn_superres;</div><div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;</div><div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span> *argv[])</div><div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;{</div><div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;    <span class="comment">// Check for valid command line arguments, print usage</span></div><div class="line"><a name="l00019"></a><span class="lineno">   19</span>&#160;    <span class="comment">// if insufficient arguments were given.</span></div><div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;    <span class="keywordflow">if</span> (argc &lt; 4) {</div><div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;        cout &lt;&lt; <span class="stringliteral">&quot;usage:   Arg 1: input video path&quot;</span> &lt;&lt; endl;</div><div class="line"><a name="l00022"></a><span class="lineno">   22</span>&#160;        cout &lt;&lt; <span class="stringliteral">&quot;\t Arg 2: output video path&quot;</span> &lt;&lt; endl;</div><div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;        cout &lt;&lt; <span class="stringliteral">&quot;\t Arg 3: algorithm | edsr, espcn, fsrcnn or lapsrn&quot;</span> &lt;&lt; endl;</div><div class="line"><a name="l00024"></a><span class="lineno">   24</span>&#160;        cout &lt;&lt; <span class="stringliteral">&quot;\t Arg 4: scale     | 2, 3, 4 or 8 \n&quot;</span>;</div><div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;        cout &lt;&lt; <span class="stringliteral">&quot;\t Arg 5: path to model file \n&quot;</span>;</div><div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;        <span class="keywordflow">return</span> -1;</div><div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;    }</div><div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;</div><div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;    <span class="keywordtype">string</span> input_path = string(argv[1]);</div><div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;    <span class="keywordtype">string</span> output_path = string(argv[2]);</div><div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;    <span class="keywordtype">string</span> algorithm = string(argv[3]);</div><div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;    <span class="keywordtype">int</span> scale = atoi(argv[4]);</div><div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;    <span class="keywordtype">string</span> path = string(argv[5]);</div><div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;</div><div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;    <a class="code" href="../../d8/dfe/classcv_1_1VideoCapture.html">VideoCapture</a> input_video(input_path);</div><div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;    <span class="keywordtype">int</span> ex = <span class="keyword">static_cast&lt;</span><span class="keywordtype">int</span><span class="keyword">&gt;</span>(input_video.get(<a class="code" href="../../d4/d15/group__videoio__flags__base.html#ggaeb8dd9c89c10a5c63c139bf7c4f5704da53e1c28d4c2ca10732af106f3bf00613">CAP_PROP_FOURCC</a>));</div><div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;    <a class="code" href="../../d6/d50/classcv_1_1Size__.html">Size</a> S = <a class="code" href="../../dc/d84/group__core__basic.html#ga346f563897249351a34549137c8532a0">Size</a>((<span class="keywordtype">int</span>) input_video.get(<a class="code" href="../../d4/d15/group__videoio__flags__base.html#ggaeb8dd9c89c10a5c63c139bf7c4f5704dab26d2ba37086662261148e9fe93eecad">CAP_PROP_FRAME_WIDTH</a>) * <a class="code" href="../../d6/d84/namespacecv_1_1quality_1_1quality__utils.html#ae55d1c89ff5761730174745401162743">scale</a>,</div><div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;                  (int) input_video.get(<a class="code" href="../../d4/d15/group__videoio__flags__base.html#ggaeb8dd9c89c10a5c63c139bf7c4f5704dad8b57083fd9bd58e0f94e68a54b42b7e">CAP_PROP_FRAME_HEIGHT</a>) * <a class="code" href="../../d6/d84/namespacecv_1_1quality_1_1quality__utils.html#ae55d1c89ff5761730174745401162743">scale</a>);</div><div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;</div><div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;    <a class="code" href="../../dd/d9e/classcv_1_1VideoWriter.html">VideoWriter</a> output_video;</div><div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;    output_video.<a class="code" href="../../dd/d9e/classcv_1_1VideoWriter.html#a0901c353cd5ea05bba455317dab81130">open</a>(output_path, ex, input_video.get(<a class="code" href="../../d4/d15/group__videoio__flags__base.html#ggaeb8dd9c89c10a5c63c139bf7c4f5704daf01bc92359d2abc9e6eeb5cbe36d9af2">CAP_PROP_FPS</a>), S, <span class="keyword">true</span>);</div><div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;</div><div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;    <span class="keywordflow">if</span> (!input_video.isOpened())</div><div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;    {</div><div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;        std::cerr &lt;&lt; <span class="stringliteral">&quot;Could not open the video.&quot;</span> &lt;&lt; std::endl;</div><div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;        <span class="keywordflow">return</span> -1;</div><div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;    }</div><div class="line"><a name="l00048"></a><span class="lineno">   48</span>&#160;</div><div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;    DnnSuperResImpl sr;</div><div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;    sr.readModel(path);</div><div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;    sr.setModel(algorithm, scale);</div><div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;</div><div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;    <span class="keywordflow">for</span>(;;)</div><div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;    {</div><div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;        <a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> frame, output_frame;</div><div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;        input_video &gt;&gt; frame;</div><div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;</div><div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;        <span class="keywordflow">if</span> ( frame.empty() )</div><div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;            <span class="keywordflow">break</span>;</div><div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;</div><div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;        sr.upsample(frame, output_frame);</div><div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;        output_video &lt;&lt; output_frame;</div><div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;</div><div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;        <a class="code" href="../../d7/dfc/group__highgui.html#ga5afdf8410934fd099df85c75b2e0888b">namedWindow</a>(<span class="stringliteral">&quot;Upsampled video&quot;</span>, <a class="code" href="../../d0/d90/group__highgui__window__flags.html#ggabf7d2c5625bc59ac130287f925557ac3acf621ace7a54954cbac01df27e47228f">WINDOW_AUTOSIZE</a>);</div><div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;        <a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>(<span class="stringliteral">&quot;Upsampled video&quot;</span>, output_frame);</div><div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;</div><div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;        <a class="code" href="../../d7/dfc/group__highgui.html#ga5afdf8410934fd099df85c75b2e0888b">namedWindow</a>(<span class="stringliteral">&quot;Original video&quot;</span>, <a class="code" href="../../d0/d90/group__highgui__window__flags.html#ggabf7d2c5625bc59ac130287f925557ac3acf621ace7a54954cbac01df27e47228f">WINDOW_AUTOSIZE</a>);</div><div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;        <a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>(<span class="stringliteral">&quot;Original video&quot;</span>, frame);</div><div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;</div><div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;        <span class="keywordtype">char</span> c=(char)<a class="code" href="../../d7/dfc/group__highgui.html#ga5628525ad33f52eab17feebcfba38bd7">waitKey</a>(25);</div><div class="line"><a name="l00071"></a><span class="lineno">   71</span>&#160;        <span class="keywordflow">if</span>(c==27)</div><div class="line"><a name="l00072"></a><span class="lineno">   72</span>&#160;            <span class="keywordflow">break</span>;</div><div class="line"><a name="l00073"></a><span class="lineno">   73</span>&#160;    }</div><div class="line"><a name="l00074"></a><span class="lineno">   74</span>&#160;</div><div class="line"><a name="l00075"></a><span class="lineno">   75</span>&#160;    input_video.release();</div><div class="line"><a name="l00076"></a><span class="lineno">   76</span>&#160;    output_video.release();</div><div class="line"><a name="l00077"></a><span class="lineno">   77</span>&#160;</div><div class="line"><a name="l00078"></a><span class="lineno">   78</span>&#160;    <span class="keywordflow">return</span> 0;</div><div class="line"><a name="l00079"></a><span class="lineno">   79</span>&#160;}</div><div class="ttc" id="classcv_1_1VideoWriter_html"><div class="ttname"><a href="../../dd/d9e/classcv_1_1VideoWriter.html">cv::VideoWriter</a></div><div class="ttdoc">Video writer class. </div><div class="ttdef"><b>Definition:</b> videoio.hpp:942</div></div>
<div class="ttc" id="highgui_8hpp_html"><div class="ttname"><a href="../../d4/dd5/highgui_8hpp.html">highgui.hpp</a></div></div>
<div class="ttc" id="group__highgui_html_ga453d42fe4cb60e5723281a89973ee563"><div class="ttname"><a href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">cv::imshow</a></div><div class="ttdeci">void imshow(const String &amp;winname, InputArray mat)</div><div class="ttdoc">Displays an image in the specified window. </div></div>
<div class="ttc" id="namespacecv_html"><div class="ttname"><a href="../../d2/d75/namespacecv.html">cv</a></div><div class="ttdoc">&quot;black box&quot; representation of the file storage associated with a file on disk. </div><div class="ttdef"><b>Definition:</b> affine.hpp:51</div></div>
<div class="ttc" id="classcv_1_1VideoWriter_html_a0901c353cd5ea05bba455317dab81130"><div class="ttname"><a href="../../dd/d9e/classcv_1_1VideoWriter.html#a0901c353cd5ea05bba455317dab81130">cv::VideoWriter::open</a></div><div class="ttdeci">virtual bool open(const String &amp;filename, int fourcc, double fps, Size frameSize, bool isColor=true)</div><div class="ttdoc">Initializes or reinitializes video writer. </div></div>
<div class="ttc" id="classcv_1_1VideoCapture_html"><div class="ttname"><a href="../../d8/dfe/classcv_1_1VideoCapture.html">cv::VideoCapture</a></div><div class="ttdoc">Class for video capturing from video files, image sequences or cameras. </div><div class="ttdef"><b>Definition:</b> videoio.hpp:664</div></div>
<div class="ttc" id="classcv_1_1Size___html"><div class="ttname"><a href="../../d6/d50/classcv_1_1Size__.html">cv::Size_</a></div><div class="ttdoc">Template class for specifying the size of an image or rectangle. </div><div class="ttdef"><b>Definition:</b> types.hpp:315</div></div>
<div class="ttc" id="group__videoio__flags__base_html_ggaeb8dd9c89c10a5c63c139bf7c4f5704da53e1c28d4c2ca10732af106f3bf00613"><div class="ttname"><a href="../../d4/d15/group__videoio__flags__base.html#ggaeb8dd9c89c10a5c63c139bf7c4f5704da53e1c28d4c2ca10732af106f3bf00613">cv::CAP_PROP_FOURCC</a></div><div class="ttdoc">4-character code of codec. see VideoWriter::fourcc . </div><div class="ttdef"><b>Definition:</b> videoio.hpp:141</div></div>
<div class="ttc" id="group__videoio__flags__base_html_ggaeb8dd9c89c10a5c63c139bf7c4f5704dab26d2ba37086662261148e9fe93eecad"><div class="ttname"><a href="../../d4/d15/group__videoio__flags__base.html#ggaeb8dd9c89c10a5c63c139bf7c4f5704dab26d2ba37086662261148e9fe93eecad">cv::CAP_PROP_FRAME_WIDTH</a></div><div class="ttdoc">Width of the frames in the video stream. </div><div class="ttdef"><b>Definition:</b> videoio.hpp:138</div></div>
<div class="ttc" id="group__videoio__flags__base_html_ggaeb8dd9c89c10a5c63c139bf7c4f5704dad8b57083fd9bd58e0f94e68a54b42b7e"><div class="ttname"><a href="../../d4/d15/group__videoio__flags__base.html#ggaeb8dd9c89c10a5c63c139bf7c4f5704dad8b57083fd9bd58e0f94e68a54b42b7e">cv::CAP_PROP_FRAME_HEIGHT</a></div><div class="ttdoc">Height of the frames in the video stream. </div><div class="ttdef"><b>Definition:</b> videoio.hpp:139</div></div>
<div class="ttc" id="namespacecv_1_1quality_1_1quality__utils_html_ae55d1c89ff5761730174745401162743"><div class="ttname"><a href="../../d6/d84/namespacecv_1_1quality_1_1quality__utils.html#ae55d1c89ff5761730174745401162743">cv::quality::quality_utils::scale</a></div><div class="ttdeci">void scale(cv::Mat &amp;mat, const cv::Mat &amp;range, const T min, const T max)</div><div class="ttdef"><b>Definition:</b> quality_utils.hpp:90</div></div>
<div class="ttc" id="group__highgui_html_ga5afdf8410934fd099df85c75b2e0888b"><div class="ttname"><a href="../../d7/dfc/group__highgui.html#ga5afdf8410934fd099df85c75b2e0888b">cv::namedWindow</a></div><div class="ttdeci">void namedWindow(const String &amp;winname, int flags=WINDOW_AUTOSIZE)</div><div class="ttdoc">Creates a window. </div></div>
<div class="ttc" id="group__core__basic_html_ga346f563897249351a34549137c8532a0"><div class="ttname"><a href="../../dc/d84/group__core__basic.html#ga346f563897249351a34549137c8532a0">cv::Size</a></div><div class="ttdeci">Size2i Size</div><div class="ttdef"><b>Definition:</b> types.hpp:347</div></div>
<div class="ttc" id="dnn__superres_8hpp_html"><div class="ttname"><a href="../../d3/db0/dnn__superres_8hpp.html">dnn_superres.hpp</a></div></div>
<div class="ttc" id="group__highgui__window__flags_html_ggabf7d2c5625bc59ac130287f925557ac3acf621ace7a54954cbac01df27e47228f"><div class="ttname"><a href="../../d0/d90/group__highgui__window__flags.html#ggabf7d2c5625bc59ac130287f925557ac3acf621ace7a54954cbac01df27e47228f">cv::WINDOW_AUTOSIZE</a></div><div class="ttdoc">the user cannot resize the window, the size is constrainted by the image displayed. </div><div class="ttdef"><b>Definition:</b> highgui.hpp:188</div></div>
<div class="ttc" id="imgproc_2include_2opencv2_2imgproc_8hpp_html"><div class="ttname"><a href="../../d1/d4f/imgproc_2include_2opencv2_2imgproc_8hpp.html">imgproc.hpp</a></div></div>
<div class="ttc" id="group__videoio__flags__base_html_ggaeb8dd9c89c10a5c63c139bf7c4f5704daf01bc92359d2abc9e6eeb5cbe36d9af2"><div class="ttname"><a href="../../d4/d15/group__videoio__flags__base.html#ggaeb8dd9c89c10a5c63c139bf7c4f5704daf01bc92359d2abc9e6eeb5cbe36d9af2">cv::CAP_PROP_FPS</a></div><div class="ttdoc">Frame rate. </div><div class="ttdef"><b>Definition:</b> videoio.hpp:140</div></div>
<div class="ttc" id="classcv_1_1Mat_html"><div class="ttname"><a href="../../d3/d63/classcv_1_1Mat.html">cv::Mat</a></div><div class="ttdoc">n-dimensional dense array class </div><div class="ttdef"><b>Definition:</b> mat.hpp:801</div></div>
<div class="ttc" id="group__highgui_html_ga5628525ad33f52eab17feebcfba38bd7"><div class="ttname"><a href="../../d7/dfc/group__highgui.html#ga5628525ad33f52eab17feebcfba38bd7">cv::waitKey</a></div><div class="ttdeci">int waitKey(int delay=0)</div><div class="ttdoc">Waits for a pressed key. </div></div>
</div><!-- fragment --><h2>Explanation </h2>
<ol type="1">
<li><b>Set header and namespaces</b> <div class="fragment"><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="../../d3/db0/dnn__superres_8hpp.html">opencv2/dnn_superres.hpp</a>&gt;</span></div><div class="line"><span class="keyword">using namespace </span>std;</div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d2/d75/namespacecv.html">cv</a>;</div><div class="line"><span class="keyword">using namespace </span>dnn_superres;</div></div><!-- fragment --></li>
<li><b>Create the Dnn Superres object</b> <div class="fragment"><div class="line">DnnSuperResImpl sr;</div></div><!-- fragment --> Instantiate a dnn super-resolution object.</li>
<li><b>Read the model</b> <div class="fragment"><div class="line">path = <span class="stringliteral">&quot;models/ESPCN_x2.pb&quot;</span></div><div class="line">sr.readModel(path);</div><div class="line">sr.setModel(<span class="stringliteral">&quot;espcn&quot;</span>, 2);</div></div><!-- fragment --> Read the model from the given path and sets the algorithm and scaling factor.</li>
<li><b>Upscale a video</b> <div class="fragment"><div class="line"><span class="keywordflow">for</span>(;;)</div><div class="line">{</div><div class="line">    Mat frame, output_frame;</div><div class="line">    input_video &gt;&gt; frame;</div><div class="line">    <span class="keywordflow">if</span> ( frame.empty() )</div><div class="line">        <span class="keywordflow">break</span>;</div><div class="line">    sr.upsample(frame, output_frame);</div><div class="line">    ...</div><div class="line">}</div></div><!-- fragment --> Process and upsample video frame by frame. </li>
</ol>
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